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Chemistry 19 Online
OpenStudy (anonymous):

Help! Hard water contains calcium and magnesium, which undergo oxidation and clog water pipes. Which statement best describes this change as a chemical change? A) Calcium and magnesium dissolve in water. B) Calcium and magnesium evaporate on contact with the walls of the pipe. C) Calcium and magnesium form precipitates of their respective oxides.

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